This option controls whether to follow LDAP referrals or not when searching for entries in the LDAP database. Possible values are on to enable following referrals, off to disable this, and auto, to use the libldap default settings. libldap's choice of following referrals or not is set in /etc/openldap/ldap.conf with the REFERRALS parameter as documented in ldap.conf(5). auto off